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Yes, this is a hard reset I know of that works on a lot of nokia phones you could give it a try it wont hurt... With the phone powered completely down press and hold the star * key, green call button key and number 3. While holding these three buttons press and hold the power button until the phone comes on. You should see your phone being formatted.

or try the link below to generate a master code. If neither of those work then this applies:

The service provider cannot help you when the passcode has been changed from the default. It is not called a security code for no reason. You have 3 choices: 1. Replace the device2. Send the device back to the manufacturer or take it to a shop to have the software flashed and reloaded3. Start at 0000 and keep adding 1 to it (0000; 0001; 0002; etc) until you hit the right number

hope this helps......SIR PLEASE VOTE GOOD...HELP US TO HELP YOU BETTER....